The treacherous expedition to Lonely Mountain has gained another traveler.

It's definitely the more the merrier when it comes to "The Hobbit," as "Boondock Saints" star Billy Connolly has joined director Peter Jackson's two-part Tolkien adaptation, according to Deadline.

Connolly joins the campaign to reclaim the lost Dwarf Kingdom of Erebor from the fearsome dragon Smaug in the role of Dain Ironfoot, a fearsome Dwarf warrior and cousin to Thorin Oakenshield (Richard Armitage). He's also the final actor to be cast in "The Hobbit."

"We could not think of a more fitting actor to play Dain Ironfoot, the staunchest and toughest of Dwarves, than Billy Connolly, the Big Yin himself," said Jackson in an official press release. "With Billy stepping into this role, the cast of 'The Hobbit' is now complete. We can’t wait to see him on the Battlefield!”

Connolly's casting comes after Jackson has already shot a good deal of the film, though there are still 100 or so days left of production in New Zealand that should be completed by July.

Our favorite Billy Connolly role is definitely Il Duce, the legendary Irish vigilante of "The Boondock Saints" and "The Boondock Saints II: All Saints Day." We also loved him in the title role of the zombie comedy, "Fido," and he managed to keep his dignity (somewhat) as a psychic pedophile ex-priest in "The X Files: I Want to Believe."

One thing's for sure -- with casting on "The Hobbit" now complete, we're even closer to actually getting to see "The Hobbit."

"The Hobbit: An Unexpected Journey" will hit theaters on Dec. 14, 2012, followed by "The Hobbit: There and Back Again" on Dec. 13, 2013.